11 34 560 Replacing all valve stem seals (N20)

WARNING: This page is about a different variant/trim than selected.

Special tools required:

Necessary preliminary tasks:

Remove CYLINDER HEAD .
Remove INTERMEDIATE LEVER
Remove ECCENTRIC SHAFT
Remove INTAKE CAMSHAFT
Remove EXHAUST CAMSHAFT .
Remove ROCKER ARMS
REMOVE all valve springs

Press special tool 11 1 480 forcefully onto valve stem seals.

Detach valve stem seal from valve stem by turning and simultaneously pulling special tool 11 1 480 .

Installation note:

Insert all VALVES .

Order number: 83 30 0 490 796

Fig 1: Detaching Valve Stem Seal

NOTE: For use on the N20 engine, special tool 11 6 380 must be remachined according to the graphic with a 10 mm dia. drill bit to a depth of B = approx. 23 mm.

This modification has already been taken into account for reordering.

Order number: 83 30 0 493 249

Fig 2: Identifying Drill Bit Depth On Special Tool (11 6 380)

IMPORTANT: Different diameters at valve stem.
All valve stem seals are colour-coded.

For 5 mm dia. valves, the valve stem seal is marked red or brown.

For 6 mm dia. valves, the valve stem seal is marked green.

Fig 3: Identifying Valve Stem Seal

Installation note:

Fit the mounting sleeves (plastic sleeves) contained in the delivery specification on the valve stem end.

Lubricate assembly sleeve.

Press on valve stem seal by hand with special tool 11 6 380 as far as it will go.

NOTE: Order number: 83 30 0 493 249

Fig 4: Pressing Valve Stem Seal

Assemble engine.